Frame Structural Part And Battery Housing With A Frame Structure Composed Of Such Frame Structural Parts

ABSTRACT

A frame structure part for forming a frame structure R s  for a battery housing  1  of an electric motor-driven motor vehicle with at least two hollow chamber profiles  2, 2.1  which are connected to one another at an angle and each have at least two chambers  3, 3.1  and a mounting surface  5, 5.1  extending in the x-y plane and located on the upper side of the hollow chamber profiles  2, 2.1  in a common plane, is characterized in that a sealing fillet  7, 7.1  following the longitudinal extension of the hollow chamber profiles  2, 2.1  is introduced into the mounting surface  5, 5.1  for receiving a seal  8,  wherein both hollow chamber profiles  2, 2.1 - 2.3  are mitered at the ends in a first profile section A extending from the mounting surface  5, 5.1  over the entire extension of the uppermost chamber in the z-direction, and the miter joints  8.1 - 8.3  are connected to one another, so that the butt-end openings of the sealing fillets  7, 7.1  of the two hollow chamber profiles  2, 2.1  adjoin one another, and in that the first hollow chamber profile  2,  in a second profile section B located in the z-direction below the first profile section A and adjoining the latter, bears with its end face against a side face  9, 12, 13  of the second hollow chamber profile  2.1  and is connected to the latter. Also described is a frame structure part composed of a frame structure part R 1 , R 2  as part of a frame structure R s , having a plurality of such frame structure parts R 1 , R 2  of a battery housing  1  of an electric motor-driven vehicle for accommodating one or more battery modules.

Subject of the invention is a frame structure part of a frame structureof a battery housing of an electric motor-driven motor vehicle with atleast two hollow chamber profiles connected to each other at an angle,each with at least two chambers arranged one above the other in thez-direction, and a mounting surface extending in the x-y plane on theupper side of the hollow chamber profiles in a common plane.

In electric motor-driven motor vehicles, such as passenger cars,industrial trucks or the like, battery modules are used as energystorage devices. Such battery modules are typically composed of a largenumber of individual battery cells. These batteries are typicallyso-called high-voltage batteries. High demands are placed on theaccommodation of such battery modules, which are necessary for theoperation of such a vehicle. It is essential that the battery modules intheir battery housing are adequately protected against crash-relatedforce inputs in order to meet the required safety standards. Inaddition, the legal requirements call for the battery housing to besealed from the environment.

DE 10 2016 115 611 B3 discloses a battery housing in which the batteryhousing has a circumferential frame structure, a base and a cover. Inthis battery housing, the frame structure enclosing a battery modulereceptacle is formed by bending a hollow profile by 90° to form acorner. This achieves the required tightness in the edge area of theframe structure, since this corner or edge area has not been joined butproduced as a single piece by bending.

From US 2011/0143179 A1, a further battery housing is known in which, inorder to provide mechanical protection, in particular for the batterymodule or modules accommodated therein, a tray part is enclosed by aframe structure, which frame structure is formed from individual profilesections assembled to form a frame profile. Extruded light metal hollowchamber profiles, typically aluminum extrusions, are used as profilesections to save weight. Due to the open-ended hollow chamber profiles,this battery housing requires frame structural parts arranged at rightangles to each other to be provided with an end piece to close the endopenings of the hollow chamber profiles in order to achieve the requiredlevel of tightness and stability. This end machining is as costly as itis complex. The connection of two arranged hollow chamber profiles knownfrom this document, in which one hollow chamber profile is supportedwith its end face against a side wall of the other hollow chamberprofile, is favorable for the desired crashworthiness of such a framestructure. Another battery housing of this type is known from DE 10 2026115 611 B3.

DE 27 53 289 A discloses a window frame consisting of mitered framemembers provided with mini tines on the mitered surfaces and gluedtogether as a prior art product.

In principle, it is also known for frame structures or frame structureparts as part of a battery housing to form welded corner joints ofhollow chamber profiles as miter joints. However, such frame structureshave only limited crashworthiness, since side impact forces acting onthe structure are introduced directly into the welded joint connectingthe miter joints as shear forces.

The circumferential mounting surface of a frame structure composed ofsuch frame structure parts is used for mounting a cover, which carries acircumferential complementary mounting flange for this purpose. A sealis placed between the perimeter mounting surface of the frame structureand that of the cover to provide the required tightness between thecover and the tray. The seal clamped between the mounting flange of thecover and the mounting surface of the frame structure. This means thatthe cover is supported and braced against the seal located on themounting surface of the frame structure. This distortion can causeswelling of the cover's mounting flange if the mechanical fasteners usedto secure the cover to the frame structure are spaced too far apart.This can lead to leaks. In addition, there is a risk that the requiredfasteners will be tensioned to different degrees, which will also resultin leaks at the interface between the cover and the frame structure.

Based on this discussed prior art, the object of the invention istherefore to provide a frame structure part for forming a framestructure for a battery housing of an electric motor-driven vehicle,which is not only simple and inexpensive to manufacture, but is alsocharacterized by a secure seal of the cover with respect to the framestructure and a crash performance that meets the requirements.

This object is solved according to the invention by a generic framestructure part mentioned at the beginning, in which a sealing filletfollowing the longitudinal extension of the hollow chamber profiles isintroduced into the mounting surface for receiving a seal, in which bothhollow chamber profiles are mitered at the ends in a first profilesection extending from the mounting surface over the extension of theuppermost chamber in the z-direction, are mitered-cut at the ends andmiter joints are connected to one another, so that the butt-end openingsof the sealing fillets of the two hollow chamber profiles adjoin oneanother, and in which the first hollow chamber profile, in a secondprofile section located in the z-direction below the first profilesection and adjoining the latter, bears with its end face against a sideface of the second hollow chamber profile and is connected to thelatter.

Such a frame structural part typically comprises two hollow chamberprofiles joined at an angle, for example to form a corner with anincluded angle of 90°. It is understood that other angles can also beenclosed by the two hollow chamber profiles. The hollow chamber profileshave at least two chambers arranged one above the other in thez-direction and a mounting surface extending in the x-y plane andarranged on the upper side of the hollow chamber profiles. It isunderstood that to form a perimeter frame structure for a batteryhousing, a plurality of frame structure parts, typically two framestructure parts each formed from two hollow chamber profiles, are joinedtogether. To realize a fluid-tight seal between a cover and thecircumferential mounting surface of the frame structure, the mountingsurface of the hollow chamber profiles has a sealing fillet followingits longitudinal extension. The sealing fillet is typically located at adistance from the boundary of the mounting surface facing the batteryvolume. According to a preferred embodiment, the sealing fillet of thehollow chamber profiles is located in the area of the outer edge of themounting surface provided with respect to the battery volume. In such anembodiment, the sealing fillet is open to the outside of the hollowchamber profile. According to one embodiment, the sealing fillet has arounded cross-sectional geometry. To seal the cover of such a batteryhousing against the frame structure, a seal is inserted into the sealingfillet, which is circumferential with respect to the frame structure.The sealing fillet not only provides a relatively large contact areabetween the seal and the mounting surface. Of particular advantage isthat the cover can be positioned or braced with its mounting flangecontacting the mounting surface of the frame structure. This ensures acircumferentially uniform bracing or arrangement of the mounting flangeof the cover relative to the mounting surface of the frame structure,wherein the seal received in the sealing fillet and placed under preloadbetween these two parts. The possibility of a contacting arrangement ofthe mounting flange of the cover on the mounting surface of the framestructure formed from the frame structure parts allows the cover to bejoined to the frame structure in a material-to-material bond, forexample by spot welding, if desired. At the same time, such a contactingarrangement of the mounting flange of the cover to the mounting surfacesof the frame structure provides electrical contacting. Sealing compoundscan also be used as seals, typically those that are curable. It is thenpossible to bond the cover to the frame structure by the sealant placedin the sealing fillet.

In order to obtain a continuous sealing fillet in the case of twoadjoining hollow chamber profiles for the formation of a frame structurepart in the case of hollow chamber profiles typically manufactured asextruded sections, the two hollow chamber profiles joined together at anangle are mitered only in the region of their uppermost section formingthe respective mounting surface. This uppermost section will typicallybe sized to extend only over the uppermost chamber of the hollow chamberprofiles. This is preferably separated from the chamber below it in thez-direction by a web running in the x-y plane. Due to this miter cut,the butt-end openings of the two sealing fillets adjoin each other ormerge into each other when the miter joints of the two frame structureparts adjoin each other or are connected to each other.

The remaining profile sections of the two hollow chamber profiles to bejoined or connected, on the other hand, are not mitered, at least not inthe case of both hollow chamber profiles. If the angle enclosed by thetwo hollow chamber profiles to form a frame structure part is not to be90°, the end faces provided on one hollow chamber profile for abutmentagainst the side wall of the other hollow chamber profile are mitered tomatch the angle provided. In this profile section of the hollow chamberprofile, the end face of one hollow chamber profile rests against a sideface of the other hollow chamber profile and is joined to this hollowchamber profile, typically by material bonding, for example by welding.This hollow chamber profile section achieves the desired crashperformance of a frame structure formed from such frame structure parts.In this respect, such a frame structure part combines the advantages ofa corner formation by miter joint with the advantages of an end face ofa second hollow chamber profile abutting a side wall of a first hollowchamber profile in terms of crash performance. At the same time, theformation of the uppermost section of the hollow chamber profile with amiter joint allows sealing fillets to be formed in the mounting surfacesof the hollow chamber profiles and the sealing fillets of twointerconnected hollow chamber profiles to adjoin and thus merge into oneanother.

To round off the inner corner formed in this way at the transition ofthe sealing fillet of a first hollow chamber profile into that of asecond hollow chamber profile, this can be appropriately reworked(rounded off) in a subsequent step, for example by milling.

A particular advantage of this concept is that the miter joint only hasto extend over a short distance in the z-direction. Thus, depending onthe design of the hollow chamber profile and its extension in thez-direction, the larger portion of the hollow chamber profile in itsextension in the z-direction can be used to form the joints that arefavorable for crash performance and are supported on a side wall of theother hollow chamber profile.

In one embodiment, to form a frame structure for a battery housing, asupporting leg is formed on the hollow chamber profiles in their lowersection. This extends in the direction of the battery volume to beaccommodated. In a front side view, such a hollow chamber profile isL-shaped. This supporting leg is also preferably designed as a hollowsingle- or multi-chamber profile leg. The supporting legs of two hollowchamber profiles arranged at an angle to each other and connected toeach other, as part of the lower section of the hollow chamber profilealready described above, adjoin a side face of the supporting leg of theother hollow chamber profile with the end face of one supporting leg.Thus, the supporting legs also help to improve crash performance.

In a frame structure built up from such frame structure parts, thesupporting legs serve to support battery modules to be accommodated inthe battery volume or also to support a base plate on which the batterymodule or modules are then arranged.

In a further development of such a frame structure part with supportinglegs formed on the hollow chamber profiles, a shoulder projecting intothe space enclosed by the hollow chamber profile and the supporting legformed thereon is formed on the hollow chamber profile and/or thesupporting leg. Typically, the shoulder is formed on both the hollowchamber profile and the supporting leg, i.e. it is located in the cornerformation formed by these two profile components. The design of thehollow chamber profile is stepped by the shoulder. Also, the shoulder,which is typically also a hollow chamber, of one hollow chamber profileabuts and is connected to the side surface of the shoulder of the otherhollow chamber profile. Thus, in such an embodiment, there are severalsupport joints located in different planes and spaced apart from eachother, i.e. joints in which a section of a first hollow chamber profileis supported with its end face against a side face of a second hollowchamber profile. These offset joints contribute in a special way tooptimizing the crash performance of a battery housing frame structureformed from such hollow chamber profiles.

The shoulder is used for placing a base plate, wherein this is connectedto the upper side of the shoulder in a fluid-tight manner, for exampleby bonding. The advantage of this embodiment is that the sections of theinterconnected hollow chamber profiles located below the base plate donot necessarily have to be joined with a sealing weld seam, and thesections of the second hollow chamber profile that are open at the endface do not have to be closed at the end face. This results in simplerproduction as well as weight and cost savings.

In a weight-optimized embodiment of this frame structure part, thehollow chamber profiles are designed as extruded aluminum profiles.

In a further embodiment, it is provided that a cover positioningextension is formed on the mounting surface, projecting orthogonallytherefrom. The cover positioning extension is an extension suitable forpositioning a cover to be placed on the mounting surface with itsmounting flange, i.e. that the cover positioning extension engages atleast somewhat in the interior of the cover. The cover positioningextension is typically located in extension of the inner wall of thehollow chamber profile. The provision of a cover positioning extensionhas the further advantage that a fillet is formed by it with themounting surface, which in turn can be used to arrange a further seal.In an embodiment in which the inside of the cover is aligned with theinside of the hollow chamber profile, the transition between the coversidewall and its mounting flange is a fillet disposed around the coverpositioning extension, spaced a small distance apart to providesufficient space to accommodate a seal. The preload force acting on aseal inserted in this fillet acts in the same way as this is describedto the seal located in the circumferential sealing fillet by supportingthe mounting flange of the cover on the mounting surface of the framestructure. Thus, in the case of a battery housing designed in this way,not only is care taken to ensure a positionally accurate arrangement ofthe cover on the frame structure and equal circumferential bracing dueto the contacting support of the mounting flange of the cover on themounting surface of the frame structure, but the possibility ofinstalling two circumferential seals spaced apart from each other isalso provided, which ensures a high degree of tightness. Particularly ifbonding of the cover to the frame structure via the seal is provided,special holding forces are achieved by these two seals arranged at adistance from each other. In this context, it should not be overlookedthat the profile sections located below the miter cut ensure optimumcrash performance.

In the hollow chamber profile, at least the upper chamber is preferablyseparated from the chamber below by a web extending in the x-y plane.This makes it easy to limit the miter joint in the z-direction. Eventhough the chambering in the other sections of the hollow chamberprofile can be made by webs with a different spatial position, tofurther optimize crash performance, the chambering in this respect willalso be made by webs running in the x-y plane and/or in the z-x plane.

The directions used in the context of these explanations—thex-direction, the y-direction and the z-direction—are as follows: Thex-direction corresponds to the longitudinal extension of a hollowchamber profile. The y-direction is the transverse direction to it. Thez-direction is the direction of the vertical axis, which is thereforeperpendicular to the x-y plane.

The invention is described below with reference to the accompanyingfigures by way of an exemplary embodiment. Showing:

FIG. 1: a perspective view of two hollow chamber profiles formanufacturing a frame structure part before their assembly,

FIG. 2: a top view of a lower part of a battery housing composed of twoframe structure parts,

FIG. 3: a perspective view of a battery housing with a base trayattached to the underside of the frame structure and a cover attached tothe frame structure, and

FIG. 4: a sectional view through the battery housing of FIG. 3 along theline of intersection A-A with an enlarged detail view.

FIG. 1 shows two hollow chamber profiles 2, 2.1 to be joined together atan angle to form a frame structural part. The two hollow chamberprofiles 2, 2.1 are shown in FIG. 1 with only one end section each. Bothhollow chamber profiles 2, 2.1 have several chambers arranged one abovethe other in the z-direction, of which only the two uppermost chambersare identified by the reference signs 3, 3.1 (see detailed drawing ofFIG. 1). In the embodiment shown, the hollow chamber profiles 2, 2.1have a total of four hollow chambers arranged one above the other. Thechambers and in particular chambers 3, 3.1 are each separated from oneanother by a web 4, 4.1 extending at right angles to the side walls ofthe hollow chamber profiles 2, 2.1 extending in the z direction. Bothhollow chamber profiles 2, 2.1 have a mounting surface 5, 5.1 on theirupper side. In the embodiment shown, this extends in the x-y plane. Themounting surfaces 5, 5.1 serve as a contact surface for connecting thecircumferential mounting flange of a cover 6 (see FIG. 3) when the framestructure part R₁ formed from the hollow chamber profiles 2, 2.1 isassembled with a further frame structure part R₂ to form a framestructure R_(s) (see FIG. 2). A sealing fillet 7, 7.1 following thelongitudinal extension of the hollow chamber profiles 2, 2.1 is providedin the mounting surfaces 5, 5.1 to accommodate a seal. The sealingfillets 7, 7.1 are located in extension of the hollow chamber profileouter walls and, as can be seen from the detailed representation of FIG.1, represent a recess with a rounded cross-sectional geometry relativeto the surface of the mounting surfaces 5, 5.1. The sealing fillets 7,7.1 are open towards the outside.

The connection concept according to which the two hollow chamberprofiles 2, 2.1 are assembled with each other to form a frame structurepart R₁, R₂ is described below on the basis of the upper section of thehollow chamber profiles 2, 2.1 with their chambers 3, 3.1.

The hollow chamber profiles 2, 2.1 are mitered in the area of theiruppermost section A. This uppermost profile section extends over thechamber 3 and part of the material thickness of the web 4. The miterjoints formed in this way in the hollow chamber profiles 2, 2.1 areidentified by the reference signs 8, 8.1. The miter cuts for forming themiter joints 8, 8.1 extend over the entire transverse extent of theprofile in the profile section A. The miter joints 8, 8.1 serve thepurpose of ensuring that the hollow chamber profiles 2, 2.1 adjoin eachother with the end face openings of their sealing fillets 7, 7.1, inorder to obtain in this way a continuous sealing fillet from themounting surface 5 of the hollow chamber profile 2 into the mountingsurface 5.1 of the hollow chamber profile 2.1.

In the profile section B located below the profile section A, the twohollow chamber profiles 2, 2.1 are not connected to each other at theend faces with complementary miter joints. In this profile section B,the end face of a first hollow chamber profile, here: the hollow chamberprofile 2, which is not mitered in the embodiment example shown, adjoinsthe side wall 9 of the profile section B of the other hollow chamberprofile, here: the hollow chamber profile 2.1. As a result of the mitercut being made to form the miter joints 8, 8.1, including only part ofthe material thickness of the web 4, 4.1, the chamber 3.1. located belowthe chamber 3 remains closed at the top (see FIG. 1).

In the embodiment shown, a supporting leg 11, 11.1 having a shoulder 10,10.1 is formed on each of the hollow chamber profiles 2, 2.1. Thesupporting legs 11, 11.1 are also designed as hollow chamber profilesections, wherein the chambering is formed by webs running in the x-zplane. The supporting legs 11, 11.1 are formed on the wall 9 of thehollow chamber profiles 2, 2.1 facing inwards in the case of the framestructure part R₁, R₂. The supporting legs 11, 11.1 form with theirshoulder 10, 10.1 a support for positioning a base plate.

To enable the connection of the hollow chamber profile 2 with its endface to the hollow chamber profile 2.1 in the area of the supportinglegs 11, 11.1 carrying the shoulders 10, 10.1, parts of its shoulder 10and its supporting leg 11 are notched in the hollow chamber profile 2.This allows the end faces formed in this way to come into full contactwith the side walls 12, 13 of the shoulder 10.1 or the supporting leg11.1. Thus, the hollow chamber profile 2 is supported at its end faceover its entire surface in its profile section B against one side wall9, 110, 13 of the hollow chamber profile 2.1 in each case.

FIG. 2 shows a plan view of a frame structure R₂ formed from two framestructure parts R₁, R₂, in which the adjacent hollow chamber profiles 2,2.1 and the remaining hollow chamber profiles 2.2, 2.3 of framestructure R₂ are adjacent to one another to form the corner. The cornerformation of the frame structure R_(s) provided by the assembled hollowchamber profiles 2, 2.1 can be seen in the detail enlargement. Theadjacent miter joints 8, 8.1 can be seen therein, as can the flatabutment of the end faces of the hollow chamber profile 2 against theside walls of the hollow chamber profile 2.1, wherein only the abutmentagainst the side walls 12 and 13 of the shoulder 10.1 and the supportingleg 11.1, respectively, can be seen. The attachment on the side wall 9is not visible, as it is located below the mounting surface 5.

As can be seen from the detailed enlargement of this figure, the edge ofthe sealing fillets 7, 7.1 pointing in the direction of the angleenclosed by the two hollow chamber profiles 2, 2.1 is rounded in thetransition area. In the embodiment shown, this has been formed by anadditional machining process. This filleting can be done after cuttingthe profile sections A to miter before joining the two hollow chamberprofiles 2, 2.1.

As can be seen in FIG. 1, the hollow chamber profiles 2, 2.1-2.3 eachhave a cover positioning extension 14 projecting from the mountingsurface 5, 5.1. The cover positioning extensions 14 extend in alignmentwith the side wall 9 and are used to position a cover 6 to be connectedto the frame structure R_(s).

FIG. 3 shows a perspective view of a battery housing 1 with the framestructure R_(s) described above, formed by the frame structure parts R₁,R₂. A base tray 15 (see also FIG. 4) is connected to the underside ofthe frame structure R_(s). On the upper side, the cover 6 is attached tothe frame structure R_(s). From the sectional view of FIG. 4 it can beseen that a base plate 16 rests on the shoulders 10, 10.1-10.3. The baseplate 16 is fluid-tightly connected to the top of the shoulders 10,10.1-10.3, for example by means of an adhesive connection. The batterymodule or modules to be accommodated in the battery housing 1 are placedon the base plate 16. Due to the sealed connection of the base plate 16to the tops of the shoulder 10, 10.1-10.3, the battery volume 17 issealed at the bottom. This has the advantage that the welded jointsbelow the base plate 16, with which the individual hollow chamberprofiles 2, 2.1-2.3 are joined together at the end faces, do notnecessarily have to be tight. This simplifies the welding process.

The cover 6 carries a circumferential, outwardly projecting mountingflange 18 on its underside, by means of which it rests on the upper sideof the mounting surfaces 5, 5.1 to 5.3. The transition of the cover 6from its side wall 19 into the mounting flange 18 is executed with theformation of a sealing fillet 20. The sealing fillet 20 is spaced asmall distance around the cover positioning extension 14 so that theinside of the side wall 19 of the cover 6 is aligned with the side wall9 of the hollow chamber profile 2.1.

To seal the cover 6 or its mounting flange 18 with respect to the upperside of the frame structure R_(s), a seal 21, in the case of theembodiment shown a curable sealing compound, is inserted into thesealing fillets 7, 7.1-7.3 before the cover 6 is mounted. Similarly, aseal 22, in the illustrated embodiment also realized by a curablesealing compound, is also introduced into the fillet formed by the coverpositioning extension 14 and the mounting surfaces 5, 5.1-5.3.Subsequent placement of the cover 6 with its circumferential mountingflange 18 on the mounting surfaces 5, 5.1-5.3 fills the as yet uncuredsealing compound to completely fill the cavities formed by the sealingfillets 7, 7.1-7.3 and the distance of the sealing fillet 20 of thecover 6 from the cover positioning extension 14. A special feature isthat the sealing fillets 7, 7.1-7.3 as well as 20 are laterally open sothat excess sealing compound is pressed out of this opening when thecover 6 with its mounting flange 18 is placed in position and thuselectrically conductive contact between the mounting flange 18 and theframe structure Rs is not impaired. In the embodiment shown, the sealantalso serves an adhesive connection between the cover 6 and the framestructure R_(s).

The invention has been described by means of an example of an embodimentwith reference to the figures. Without departing from the scope of theapplicable claims, there are further possibilities for a person skilledin the art to implement the invention without this having to beexplained in more detail within the scope of the present embodiments.

LIST OF REFERENCE SIGNS

1 Battery housing

2, 2.1-2.3 Hollow chamber profile

3, 3.1-3.3 Chamber

4, 4.1 Web

5, 5.1-5.3 Mounting surface

6 Cover

7, 7.1-7.3 Sealing fillet

8, 8.1-8.3 Miter joint

9 Side wall

10, 10.1-10.3 Shoulder

11, 11.1-11.3 Supporting leg

12 Side wall

13 Side wall

14 Cover positioning extension

15 Base tray

16 Base plate

17 Battery volume

18 Mounting flange

19 Side wall

20 Sealing fillet

21 Seal

22 Seal

A Profile section

B Profile section

R₁, R₂ Frame structure part

R_(s) Frame structure

1. Frame structure part of a frame structure (R_(s)) of a batteryhousing (1) of an electric motor-driven motor vehicle with at least twohollow chamber profiles (2, 2.1-2.3) which are connected to each otherat an angle and each have at least two chambers (3, 3.1) arranged oneabove the other in the z-direction, and have a mounting surface (5, 5.1)extending in the x-y plane which is located on the upper side of thehollow chamber profiles (2, 2.1-2.3) in a common plane (5, 5.1),characterized in that a sealing fillet (7, 7.1-7.3) following thelongitudinal extension of the hollow chamber profiles (2, 2.1-2.3) isintroduced into the mounting surface (5, 5.1) for receiving a seal (8),in that both hollow chamber profiles (2, 2.1-2.3) are mitered at theends in a first profile section (A) extending from the mounting surface(5, 5.1) over the entire extension of the uppermost chamber (3) in thez-direction, and the miter joints (8.1-8.3) are connected to each other,so that the butt-end openings of the sealing fillets (7, 7.1-7.3) of thetwo hollow chamber profiles (2, 2.1-2.3) adjoin each other, and in thatthe first hollow chamber profile (2, 2.2) in a second profile section(B), which is located in the z-direction below the first profile section(A) and adjoins the latter, bears with its end face against a side face(9, 12, 13) of the second hollow chamber profile (2.1, 2.3) and isconnected to the latter.
 2. Frame structure part according to claim 1,characterized in that the sealing fillets (7, 7.1-7.3) are curved on theinside in the region of the adjacent miter joints (8, 8.1-8.3).
 3. Framestructure part according to claim 1 or 2, characterized in that thesealing fillet (7, 7.1-7.3) is open to a side wall of the hollow chamberprofile (2, 2.1-2.3).
 4. Frame structure part according to any one ofclaims 1 to 3, characterized in that a supporting leg (11, 11.1) isformed on each of the hollow chamber profiles (2, 2.1), and in that thesupporting leg (11) of the first hollow chamber profile (2, 2.2) adjoinsthe side surface of the supporting leg (11.1) of the second hollowchamber profile (2.1, 2.3) at the end with its end face, whereby thecross section of each hollow chamber profile (2, 2.1-2.3) is L-shaped.5. Frame structure part according to claim 4, characterized in that ashoulder (10, 10.1-10.3) is integrally formed on the hollow chamberprofile (2, 2.1-2.3) and/or the supporting leg (11, 11.1-11.3), and inthat the shoulder (10, 10.2) of the first hollow chamber profile (2,2.2) adjoins the side face (12) of the shoulder (10.1, 10.3) of thesecond hollow chamber profile (2.1, 2.3) with its end face and isconnected thereto.
 6. Frame structure part according to claim 5,characterized in that the shoulder (11, 11.1-11.3) of the hollow chamberprofiles (2, 2.1-2.3) is itself designed as a hollow chamber.
 7. Framestructure part according to any one of claims 1 to 6, characterized inthat a cover positioning extension (14) projecting orthogonally from themounting surface (5, 5.1-5.3) and aligned with the inner side wall (9)of the hollow chamber profiles (2, 2.1-2.3) is integrally formed on themounting surface (5, 5.1-5.3).
 8. Frame structure part according to anyone of claims 1 to 7, characterized in that the uppermost chamber (3) ofthe hollow chamber profiles (2, 2.1-2.3) is separated from the chamber(3) located below it in the z-direction by a web (4, 4.1) running in thex-y plane.
 9. Frame structural part according to any one of claims 1 to8, characterized in that the hollow chamber profiles (2, 2.1-2.3) of theframe structural part (R₁, R₂) are extruded aluminum profiles.
 10. Framestructure part according to any one of claims 1 to 9, characterized inthat the frame structure part (R₁, R₂) is part of a frame structure(R_(s)), having a plurality of such frame structure parts (R₁, R₂), of abattery housing (1) of an electric motor-driven vehicle foraccommodating one or more battery modules.
 11. Battery housing for anelectric motor-driven vehicle having a cover (6), a base and a framestructure (R_(s)) enclosing a battery module receptacle, composed of aplurality of frame structure parts (R1, R2) according to any one ofclaims 4 to 10, characterized in that the cover (6) has acircumferential mounting flange (18) which is supported in a contactingmanner on the mounting surfaces (5, 5.1-5.3) of the frame structure(R_(s)), wherein a circumferential seal (21) is arranged in thecircumferential sealing fillet (7, 7.1-7.3).
 12. Battery housingaccording to claim 11 in its reference back to claim 6, characterized inthat the cover (6) has, in the transition from its side wall (19) intoits mounting flange (18), a sealing fillet (20) following the contour ofthe cover positioning extension (14), in which a seal (22) is arranged.13. Battery housing according to claim 11 or 12, characterized in thatthe seals (21, 22) are curable sealing compounds with which the cover(6) is bonded to the frame structure (R_(s)).
 14. Battery housingaccording to any one of claims 12 to 13, characterized in that the baseis designed as a base plate (16) and rests on the upper side of thesupporting legs (11, 11.1-11.3) or the upper side of the shoulders (10,10.1-10.3) supported by the supporting legs (11, 11.1-11.3) and isconnected thereto in a media-tight manner.